[py-dev] Greenlet debugging

[Tom Locke]

Hi,

I'm having a bash at adding debugging support for greenlets.

Specifically, I'd like to get a callback on the global trace function, 
with the `event` arg set to "switch", whenever a greenlet switch takes 
place (just after).

I'm also going to build a pdb.Pdb subclass that provides some support 
for this. (e.g. a "sw" command, meaning "run until next switch").

Any comments / guidance appreciated

 - Is this a good idea?

 - Any reason this can't work?

 - Will there be difficulties making this thread safe?

Thanks

Tom.